<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" xmlns:xi="http://www.w3.org/2001/XInclude" type="guide" style="task" id="treeview_advanced_liststore.py" xml:lang="fr">

  <info>

    <title type="text">Simple Treeview with ListStore (Python)</title>

    <link type="guide" xref="beginner.py#treeview"/>

    <link type="next" xref="treeview_cellrenderertoggle.py"/>

    <revision version="0.1" date="2012-06-30" status="draft"/>

    <credit type="author copyright">

      <name>Marta Maria Casetti</name>

      <email its:translate="no">mmcasetti@gmail.com</email>

      <years>2012</years>

    </credit>

    <desc>Une TreeView affichant un ListStore (exemple plus complexe)</desc>

    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">

      <mal:name>Luc Rebert,</mal:name>

      <mal:email>traduc@rebert.name</mal:email>

      <mal:years>2011</mal:years>

    </mal:credit>

    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">

      <mal:name>Alain Lojewski,</mal:name>

      <mal:email>allomervan@gmail.com</mal:email>

      <mal:years>2011-2012</mal:years>

    </mal:credit>

    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">

      <mal:name>Luc Pionchon</mal:name>

      <mal:email>pionchon.luc@gmail.com</mal:email>

      <mal:years>2011</mal:years>

    </mal:credit>

    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">

      <mal:name>Bruno Brouard</mal:name>

      <mal:email>annoa.b@gmail.com</mal:email>

      <mal:years>2011-12</mal:years>

    </mal:credit>

    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">

      <mal:name>Luis Menina</mal:name>

      <mal:email>liberforce@freeside.fr</mal:email>

      <mal:years>2014</mal:years>

    </mal:credit>

  </info>

  <title>More Complex Treeview with ListStore</title>

  <media type="image" mime="image/png" src="media/treeview_advanced_liststore.png"/>

  
Ce Treeview affiche un ListStore tout simple avec le signal « changed » de la sélection connecté.

  <links type="section"/>

  <section id="code">

    <title>Code utilisé pour générer cet exemple</title>

    from gi.repository import Gtk

from gi.repository import Pango

import sys

list_of_dvd = [["The Usual Suspects"],

               ["Gilda"],

               ["The Godfather"],

               ["Pulp Fiction"],

               ["Once Upon a Time in the West"],

               ["Rear Window"]]

class MyWindow(Gtk.ApplicationWindow):

    def __init__(self, app):

        Gtk.Window.__init__(self, title="My DVDs", application=app)

        self.set_default_size(250, 100)

        self.set_border_width(10)

        # the data are stored in the model

        # create a liststore with one column

        self.listmodel = Gtk.ListStore(str)

        for i in range(len(list_of_dvd)):

            self.listmodel.append(list_of_dvd[i])

        # a treeview to see the data stored in the model

        view = Gtk.TreeView(model=self.listmodel)

        # cellrenderer for the first column

        cell = Gtk.CellRendererText()

        # the first column is created

        col = Gtk.TreeViewColumn("Title", cell, text=0)

        # and it is appended to the treeview

        view.append_column(col)

        # when a row of the treeview is selected, it emits a signal

        self.selection = view.get_selection()

        self.selection.connect("changed", self.on_changed)

        # the label we use to show the selection

        self.label = Gtk.Label()

        self.label.set_text("")

        # a button to add new titles, connected to a callback function

        self.button_add = Gtk.Button(label="Add")

        self.button_add.connect("clicked", self.add_cb)

        # an entry to enter titles

        self.entry = Gtk.Entry()

        # a button to remove titles, connected to a callback function

        self.button_remove = Gtk.Button(label="Remove")

        self.button_remove.connect("clicked", self.remove_cb)

        # a button to remove all titles, connected to a callback function

        self.button_remove_all = Gtk.Button(label="Remove All")

        self.button_remove_all.connect("clicked", self.remove_all_cb)

        # a grid to attach the widgets

        grid = Gtk.Grid()

        grid.attach(view, 0, 0, 4, 1)

        grid.attach(self.label, 0, 1, 4, 1)

        grid.attach(self.button_add, 0, 2, 1, 1)

        grid.attach_next_to(

            self.entry, self.button_add, Gtk.PositionType.RIGHT, 1, 1)

        grid.attach_next_to(

            self.button_remove, self.entry, Gtk.PositionType.RIGHT, 1, 1)

        grid.attach_next_to(

            self.button_remove_all, self.button_remove, Gtk.PositionType.RIGHT, 1, 1)

        # add the grid to the window

        self.add(grid)

    def on_changed(self, selection):

        # get the model and the iterator that points at the data in the model

        (model, iter) = selection.get_selected()

        # set the label to a new value depending on the selection, if there is

        # one

        if iter is not None:

            self.label.set_text("\n %s" % (model[iter][0]))

        else:

            self.label.set_text("")

        return True

    # callback function for the "Add" button

    def add_cb(self, button):

        # append to the model the title that is in the entry

        title = self.entry.get_text()

        self.listmodel.append([title])

        # and print a message in the terminal

        print("%s has been added" % (title))

    def remove_cb(self, button):

        # if there is still an entry in the model

        if len(self.listmodel) != 0:

            # get the selection

            (model, iter) = self.selection.get_selected()

            # if there is a selection, print a message in the terminal

            # and remove it from the model

            if iter is not None:

                print("%s has been removed" % (model[iter][0]))

                self.listmodel.remove(iter)

            # otherwise, ask the user to select something to remove

            else:

                print("Select a title to remove")

        # else, if there are no entries in the model, print "Empty list"

        # in the terminal

        else:

            print("Empty list")

    def remove_all_cb(self, button):

        # if there is still an entry in the model

        if len(self.listmodel) != 0:

            # remove all the entries in the model

            for i in range(len(self.listmodel)):

                iter = self.listmodel.get_iter(0)

                self.listmodel.remove(iter)

        # print a message in the terminal alerting that the model is empty

        print("Empty list")

class MyApplication(Gtk.Application):

    def __init__(self):

        Gtk.Application.__init__(self)

    def do_activate(self):

        win = MyWindow(self)

        win.show_all()

    def do_startup(self):

        Gtk.Application.do_startup(self)

app = MyApplication()

exit_status = app.run(sys.argv)

sys.exit(exit_status)

  </section>

  <section id="methods">

    <title>Méthodes utiles pour un élément graphique TreeView</title>

    
The TreeView widget is designed around a Model/View/Controller design: the Model stores the data; the View gets change notifications and displays the content of the model; the Controller, finally, changes the state of the model and notifies the view of these changes. For more information and for a list of useful methods for TreeModel see <link xref="model-view-controller.py"/>.

    
In line 36 the "changed" signal is connected to the callback function on_changed() using widget.connect(signal, callback function). See <link xref="signals-callbacks.py"/> for a more detailed explanation.

  </section>

  <section id="references">

    <title>Références API</title>

    
Dans cet exemple, les éléments suivants sont utilisés :

    <list>

      <item>
<link href="http://developer.gnome.org/gtk3/unstable/GtkTreeView.html">GtkTreeView</link>
</item>

      <item>
<link href="http://developer.gnome.org/gtk3/unstable/GtkTreeModel.html">GtkTreeModel</link>
</item>

      <item>
<link href="http://developer.gnome.org/gtk3/unstable/GtkListStore.html">GtkListStore</link>
</item>

      <item>
<link href="http://developer.gnome.org/gtk3/unstable/GtkCellRendererText.html">GtkCellRendererText</link>
</item>

      <item>
<link href="http://developer.gnome.org/gtk3/unstable/GtkTreeViewColumn.html">GtkTreeViewColumn</link>
</item>

      <item>
<link href="http://git.gnome.org/browse/pygobject/tree/gi/overrides/Gtk.py">pygobject - Python bindings for GObject Introspection</link>
</item>

    </list>

  </section>

</page>